Electric welding-machine.



T. E. MURRAY 81 H. R. WOODROW.

ELECTRIC WELDING MACHINE.

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T. E. MURRAY & H. R. WOODROW.

ELECTRIC WELDING MACHINE.

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T. E. MURRAY & H. R. WOODROW. ELECTRIC WELDING momma.

' APPLICATION FILED MR. 8. I916.

Patented June 20, 1916.

H SHEETS-SHEET 4.

.2 V 5] vwe'wtoz 6 SEW THE COLUMBIA PLANOCIRAPM co, WASHINGTON, n. c.

T. E. MURRAY & H. R. WOODROW.

ELECTRIC WELDING MACHINE.

APPLICATION FILED MAR. 8. I916.

Patented June 20, 1916.

H SHEETSSHEET 5- 1' coumnm XLANOGRAPH T. E. MURRAY & H. R. WOODROW.

ELECTRIC WELDING MACHINE.

APPLICATION FILED MAR. 8, 1916. 1,187,543. Patented June 20,1916.

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ELECTRIC WELDING MACHINE.

APPLICATION FILED MAR.8,1916.

Patented June 20, 1916.

H SHEETS-SHEET I.

. WASHINGTON n c T. E. MURRAY & H. R. WOODROW.

ELECTRIC WELDING MACHINE.

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ELECTRIC WELDING MACHINE.

APPLICATION man MAR. s. 1916.

Patented June 20, 1916.

H SHEET$-SHEET 9- r"- l L T. E. MURRAY & H. R. WOODROW.

ELECTRiC WELDING MACHINE.

APPLICATION men MAR. a. me.

1 ,187,543. Patented June 20, 1916.

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THE COLUMBIA PLANouRAPi-l c0, WAsmNc'mN, D. C.

UNITED STATES PATENT OFFICE.

THOMAS E. MURRAY AND HARRY R. WOODROW, OF NEW YORK, N. Y.; SAID WOODROW ASSIGNOR TO SAID MURRAY.

ELECTRIC WELDING-MACHINE.

Application filed March 8, 1916.

To all whom it may concern Be it known that we, THOMAs E. MURRAY and HARRY R. IVooonow, citizens of the United States, residing at New York, in the county of New York and State of New York, have invented a certain new and useful Improvement in Electric Welding-Machines, of which the following is a specification.

The invention relates to electric welding machines, and more especially to an automatically operating machine for electrically welding together the half sections of a sheet metal hub for vehicle wheels.

The hub sections are placed together, with their edges registering in a suitably recessed fixed lower electrode, which forms one mem ber of a clamp. The upper and movable electrode, which forms the other member of said clamp, is brought down upon said hub sections. IV hen the movable electrode is suited onthe hub, circuit is closed through the secondary of a transformer, which de lirers the welding current, and while said welding current is passing, electro-magnets operate a toggle mechanism, which acting on the upper electrode forces down said electrode to exert increased pressure on the joint.

The invention consists in the construction hereinafter set forth, and the circuit connections and instrumentalities therein, whereby the machine is caused to operate automatically.

In the accompanying drawings, Figurel is an end elevation of our hub welding machinc. Fig. 2 is a side elevation, the upper portion of the machine being in section on the line 2, 2 of Fig. 4. Fig. 3 is a similar elevation to Fig. 2, also in section on the line 2, 2 of Fig. 4. In Fig. 2 the hub clamp is shown open, and in Fig. 3 closed. Fig. 4 is a top plan view. Fig. 5 is a section on the line 5, 5 of Fig. 2. Fig. 6 is a detailed enlarged elevation of the hub clamp and pressing toggles, the hub clamp not being completely closed. Fig. 7 is a section on the line 7, 7 of Fig. 2, showing the toggle mechanism in top view. Fig. 8 is an enlarged section on the line 8, 8 of Fig. 2. Fig. 9 is an enlarged section on line 9, 9 of Fig. 3. Fig. 10 is an enlarged section on line 10, 10 of Fig. Fig. 11 is a section on the line 11, 11 of Fig. 3. Fig. 12 is a plan view looking into one of the hub sections. Fig. 13 is a plan view of the exterior of a hub section.

Specification of Letters Patent.

Patented June 2-0, 1916.

Serial No. 82,811.

Fig. 14 is a side elevation of the sections of the hub separated. F ig. 15 is a similar elevation, showing the sections of the hub after being welded together. Fig. 16 is a top view of the transformer. Figs. 17, 18, 19, 20 and 21 are electrical diagrams, showing the circuits and positions of the various parts of the machine during the operation thereof.

Similar numbers and letters of reference indicate like parts.

The hub, Figs. 12, 13, 14, 15, is composed of two struck up metal plates .9, s, precisely alike, having a central opening for the axle, and equally spaced projections around their circumferential peripheries. These two plates, each forming a half section of the hub, are to be welded at their registering edges, Figs. 14 and 15. In another application for Letters Patent, Serial No. 71,616, filed January 12, 1916, we have set forth a machine for feeding spokes to this hub and for welding them thereto. The function of the present machine is automatically and electrically to weld together the two hub sections.

Supported on the bed 20 are four hollow standards '21, 22, 23, 24, each having a shoulder 25, Fig. 2, and on opposite sides angle-irons 26, said angle-irons supporting shelves upon which are bolted the turned down and flan ed corners of the table A, Fig. 3.

(in the base between the standards is the pentagonal. core 27 of the transformer B- see Fig. 16. In Fig. 2 one side of the core is omitted for clearness. The core is composed of horizontal laminations held be tween upper and lower frames connected by bolts. Qn each of the live sides of the core is wound a primary coil 28 in two layers, Fig. 16, and outside of the primary coil is wound the secondary coil 29.

One terminal of each secondary coil is connected to a cylindrical metal block 30, disposed below the table A. The remaining secondary terminals are connected to separate metal blocks 31, Fig. 3, insulated from the table, and supported below the same by threaded rods 32, Fig. 3. Said rods enter contact plates 33 on the upper side of said table, which are disposed in a circle around a central insulated block 34. Block 34 has a downward central projection which enters a socket in the block 30, and said blocks 34 e1 to 3 ted the sand 135 101 1he1 s 1 are The mode hoi't 111m he pivo 1 side d to the such a connec- 11ed o 11 recei e heoncmte eii 11 ends 111' new Q net .i'ongh t catc1 cti'o-n stand 1 .111011 is 111(- indi hich at 1 .111111; 1e1'ez's G is increased pi'es- 11 5 :111 d t 1e tie-111:1

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device, therefore, 1. id 11111 on'ering 0 so that p thron e and t0 '1 and These and position, as Q 1S aised 11K]. frame and hence in 1 he 101*- 58 on the inner sides 5 21 join'nzde 1 puifie s l are attach WG Q'11tS 50 e 111111115 1101 the upper shown in of the four standa tra cted, the

ner sides of the members of the lever arm K are secured rings 69, suitably recessed to receive the ends of an electro-magnet L. Said magnet has disk armatures 70, 71 at its opposite ends, each having on its inner side a guide rod 72, and on its outer side a pin 73. A helical spring'fl is disposed within the magnet and normally sets out the pins 78 which enter openings in the members of lever arm K. There are also openings in the members of link J, but the pins 73 cannot enter the link openings until after said link openings come into registry with the lever arm openings. Thus, referring to Fig. 8, pins 73 being retracted are in the lever arm openings, but are not in the link openings in the link arms because said openings are not in registry. The outer ends of the pins then simply abut against the link members. In Figs. 9 and 10 the openings in the link J and lever arm K have come into registry, and the electro-magnet having released the pins 7 3, they have been removed outwardly by the spring 7 L to enter the registering openings in link and 1e ver arm, and so to lock said link and lever arm together. This locking of lever arms K and links J occurs just efore the mag nets H exert their power on toggle I to cause said toggle to act upon frame E. When the pins 73 are moved into locking position, they close pairs of spring contacts on opposite sides of the link arms, as shown in Fig. 10, and when said pins are re said contacts separate, as shown in Fig. 8.

In order that the link J may be guided into proper position for registry of its openings with the openings in the lever arm K, we provide on said arm K pins 76 which are received and move freely in an elongated slot 77, Fig. 6, in said link. lVhen the toggle l in laterally extended. position, as shown in Fig. 2, the pins 76 are in the inner ends of the slots 76, and when said toggle is in the position shown in Fig. 6, the pins are in the outer ends of said slots. it will, of course, he noted that the pins and slots are only a guide device, and that the pressure exerted by the magnets H is not transmitted through said pins to the links J.

The circuits in the apparatus and their changes during its operation will now he described.

Fig. 17 shows the conditions when the machine is ready to begin its operation. The frame E is raised by the weights 55, and the toggle I is laterally extended. The switch M opens and closes circuit to the main source of alternating current supply for the transformer. The switch N opens and closes circuit to asource of direct current supply which energizes the various electromagnets.

A Wattmeter relay W is provided for antoniatically controlling the duration of the welding current. The terminals of one of the coils in said relay are connected to a current transformer a. The terminals of the other coil are respectively connected to one terminal Z) of switch M and to a contact 0 of switch Q. There are two similar switches O, P. The contact Z of switch 0 is connected to contact 0 of switch P, and the contact f of switch P is connected to the contact g of switch M.

The switches O, P are carried on rods which enter magnet coils n, a respectively above and below said switches, whereby when either the upper or the lower coils are energized, said switches are moved to open or close circuit. At'z' and j are pairs of normally open spring contacts, contacts a being closed when switch 0 is opened, and 0011- tacts 7' being closed when switch P is closed. The terminals of the primary winding of transformer B are connected to the contacts 6 and 0.

At Q is shown the master or controlling switch lever which cooperates with two contacts Z? and Z. Said lever is connectedto one contact of switch Q. At the outset, as shown in Fig. 1, the switch Q, switch M, switch N and switch 0 are open. Switch P is closed. The operator having placed the hub sections edge to edge in the electrode D, moves switch Q, to close contact at 1. The resulting active circuit is shown in heavy lines in Fig. 18: that is to say, the magnet F is energized and begins to draw downwardly the sliding frame E. This downward movement continues until the hub sec tions are clamped hetween electrodes C, D, at which time the brushes 37 meet the contact plates 33 on table A. The resulting condition is shown Fig. 19. The wattrneter TV begins to operate, so that its moving member travels toward. a contact 0. In Fig. 19, said moving member is shown as not laving yet reached said contact- 0. The lower controlling coil of switch 0 is energland to close circuit at contacts 0, (Z. Circuit thus being established to the transformer B, the welding of the hub sections begins. At the same time the magnets H are energized to apply heavy pressure through the t4. 7 le T at the welding joint. The electro-ma nets L are not yet energized, so that the contacts which they control remain closed.

The wattmeter W after a certain predetermined period of timewhich is the welding periodcloses contact at 0, as shown in Fig. 20, so closing circuit through the upper controlling coil of switch P, raising said switch and interrupting the welding current to transformer B. The operator now throws master lever Q, to contact is. The result is shown in Fig. 21. The lower controlling coil 12/ of switch P being energized keeps npris- "urod or the g and ally essure to np 1s :npris- 1 and oper- -e to said inatlc means for 1 elecnnp f openin a. movable electrode,

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ism i'o "oldies i" 1', E cu oee, and meelian or said e 11g machine, como elecd, eleo all trodes i I'Qn' sai (1 com- or ng a clamp ded. means for mend to apply p grode when 1 a variable resistance p'net. Welding machine, t" of vertical standards, 1 rted by said stand said Ways and no able 1n be Weld ieans for closm sure,

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spose W:- 6 di to be welded, a fixed electrode forming the other member of said clamp, and a support for said fixed electrode.

12. An electric welding machine, comprising a plurality of vertical standards, vertical ways supported by said standards, a frame siidable in said ways and having a bottom member, a transverse support extending between two of said standards, a toggle pivoted at its upper joint to said support and at its lower joint to said bottom frame member, bell crank levers pivoted to said transverse support and their inner arms mechanically connected to the side oints of said toggle, electro-magnets having their armatures connected to the outer arms of said levers, an electrode carried by said frame and forming one member of a clamp for holding the bodies to be welded, a fixed electrode forming the other member of said clamp, and a support for said fixed electrode.

13. An electric welding machine, com prising a fixed electrode forming one member of a clamp for the bodies to be welded, a vertically movable electrode forming the other member of said clamp, means for raising and lowering said movable electrode, a fixed support, a link, a toggle having its ends respectively pivoted to said fixed support and said movable electrode and its intermediate joint to said link, a bell crank lever pivoted at its angle to said fixed support, an electro-magnet having its armature connected to the outer horizontal arm of said lever, and automatically operating means for locking together said vertical lever arm and said link upon the closing of said clamp.

14. An electric welding machine, comprising a fixed electrode forming one member of a clamp for the bodies to be welded, a vertically movable electrode forming the other member of said clamp, means for raising and lowering said movable electrode, a fixed support, a link, a toggle having its ends respectively pivoted to said fixed support and said movable electrode and its intermediate joint to said link, a bell crank lever pivoted at its angle to said fixed support, there being an opening in said link and an opening in an arm of said lever, an electro-magnet carried by said lever arm, a pin on the magnet armature adapted to enter said link and lever arm openings when in registry to lock together said link and lever arm, a setting out spring for said pin, and an electro-magnet having its armature connected to the other arm of said bell crank lever.

15. An electric welding machine, comprising a fixed electrode forming one member of a clamp for the bodies to be welded, a vertically movable electrode forming the other member of said clamp, means for raising and lowering said movable electrode, a fixed support, a link, a toggle having its ends respectively pivoted to said fixed support and said movable electrode and its intermediate joint to said link, a bell crank lever pivoted at its angle to said fixed support, there being an opening in said link and an opening in an arm of said lever, an electro-magnet carried by said lever arm, a pin on the magnet armature adapted to enter said link and lever arm openings when in registry to lock together said link and lever arm, a setting out spring for said pin, means for guiding said link and lever arm to bring said openings into registry when said clamp is closed, and an electro-magnet having its armature connected to the other arm of said bell crank lever.

16. An electrically operated apparatus for electric welding, comprising two clamping electrodes receiving between them the bodies to be welded, means for controlling the clamping of said bodies in said electrodes, an electro-niagnet actuating said clamp controlling means and connected in direct current circuit, and means for establishing alternating current circuit at the welding joint.

17. An electrically operating apparatus for electric welding, comprising two clamping electrodes receiving between them the bodies to be welded, means for controlling the clamping of said bodies in said electrodes, an electro-magnet actuating said clamp controlling means and connected in direct cu rent circuit, means for establishing alternating current circuit at the welding joint, and means for determining the duration of said welding current.

18. An electrically operated apparatus for electric welding, comprising electrodes receiving between them the bodies to be welded, means for establishing circuit at the welding joint operated by direct current, means for establishing an alternating current circuit at the welding joint, and electrically controlled means for determining the duration oi said welding current.

19. An electrically operated apparatus for electric welding, comprising two clamping electrodes receiving between them the bodies to be welded, means for controlling the clamping of said bodies in said electrodes, an electro-magnet actuating said clamp controlling means and connected to a direct current circuit, means for establishing an alternating current circuit at the welding joint, means for subjecting the joint between said bodies to increased pressure after said clamping is effected, and an electromagnet actuating said pressure means, the said magnets being connected to a source of direct on rent.

20. An electrically operated apparatus for electric welding, comprising two clamping iii electrodes receiving between them the bodies to be welded, means for controlling the clamping of said bodies in said electrodes, an electro-nnignet actuating said clamp controlling means and connected to a direct current circuit, means for establishing an alternating current circuit at the welding joint, means for subjecting the joint between said bodies to increased pressure after said clamping is effected, an electro-magnet actuating said pressure means, the said magnets being connected to a source of direct current, and means for determining the duration of said welding current.

521. rn electrically operated apparatus ctric welding, comprising electrodes eceiring between them the bodies to be means for opening and closing said les, electrically operated means for opening and closing the alternating current welding circuit, and electrically operated means for subjecting the joint between said bodies to pressure during the welding operation, the said lastnientioned three means be ing disposed in a direct current circuit and actuated by said current.

in electrically operated apparatus for electric welding,comprising electrodes receirin between them the bodies to be welded, one of said electrodes being movable toward and from the other electrode, means for supplying an alternating current to the welding joint, electrically operated means for merin said morable electrode into welding contact, electrically operated means for oeening and closing the alternating current welding circuit, electrically operated means for subjecting the movable electrode to pressure during the welding operation, and electrically operated means for disconnecting said pressure means from said movable electrode at all other times; the said lastmentioned tour means being disposed in a direct current circuit and actuated by said current.

in electrically operated app rains for electric welding, comprising clamping electrodes for the bodies to be welded, electrically operated. means for closing said clamp, electrica ly operated means for subjecting said clamp to increased pressure, and electrically operated means for locking said pressure means to said clamp, the said clamp closing means, pressure means and locking means being in direct current circuit, means for establishing alternating current at the welding joint, a manually controllable switch lever, and two contacts cooperating therewith and connected in said direct current circuits: whereby upon the movement cl said lever to one contact, said closing means, presser means and locking means shall be operated and welding current established, and upon the movement of said lever to the other contact, said welding current shall be interrupted and said locking means and clamp closing means released.

In testimony whereof we hate atlixed our signatures in presence 01 two witnesses.

THOilliS E. MURRAY. HARRY VGODROW'. ll itnesses Gmrrannn T. PORTER, MAY 1. MoGiinnr.

Copies of this patent may be obtained for five cents each, by addressing the fiommissioner of Patents, Washington, D. G. 

